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Update. 

2000-09-26  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/gethostid.c (sethostid): Use O_TRUNC to
	remove possible garbage at the end of the file.

	* stdio-common/tmpnam_r.c: Warn about insecure tmpnam_r.
	* stdio-common/tmpnam.c: Warn about insecure tmpnam.
	* stdio-common/tempnam.c: Warn about insecure tempnam.
	* misc/mktemp.c: Warn about insecure mktemp.
This commit is contained in:
Ulrich Drepper 2000-09-26 07:18:57 +00:00
parent 3ee561ad46
commit e5448d7ad2
7 changed files with 38 additions and 7 deletions
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10
ChangeLog
View File

@ -1,5 +1,15 @@
2000-09-26 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/gethostid.c (sethostid): Use O_TRUNC to
remove possible garbage at the end of the file.
2000-09-25 Ulrich Drepper <drepper@redhat.com>
* stdio-common/tmpnam_r.c: Warn about insecure tmpnam_r.
* stdio-common/tmpnam.c: Warn about insecure tmpnam.
* stdio-common/tempnam.c: Warn about insecure tempnam.
* misc/mktemp.c: Warn about insecure mktemp.
* sysdeps/unix/sysv/linux/check_fds.c: New file.
* sysdeps/generic/check_fds.c: Check that file opened is really
/dev/null.

12
manual/filesys.texi
View File

@ -2870,7 +2870,7 @@ file is created another process might have created a file with the same
name using @code{tmpnam}, leading to a possible security hole. The
implementation generates names which can hardly be predicted, but when
opening the file you should use the @code{O_EXCL} flag. Using
@code{tmpfile} is a safe way to avoid this problem.
@code{tmpfile} or @code{mkstemp} is a safe way to avoid this problem.
@end deftypefun
@comment stdio.h
@ -2881,6 +2881,9 @@ that if @var{result} is a null pointer it returns a null pointer.
This guarantees reentrancy because the non-reentrant situation of
@code{tmpnam} cannot happen here.
@strong{Warning}: This function has the same security problems as
@code{tmpnam}.
@end deftypefun
@comment stdio.h
@ -2937,6 +2940,13 @@ The directory @file{/tmp}.
@end itemize
This function is defined for SVID compatibility.
@strong{Warning:} Between the time the pathname is constructed and the
file is created another process might have created a file with the same
name using @code{tempnam}, leading to a possible security hole. The
implementation generates names which can hardly be predicted, but when
opening the file you should use the @code{O_EXCL} flag. Using
@code{tmpfile} or @code{mkstemp} is a safe way to avoid this problem.
@end deftypefun
@cindex TMPDIR environment variable

4
misc/mktemp.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
/* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -32,3 +32,5 @@ mktemp (template)
return template;
}
link_warning (mktemp, "the use of `mktemp' is dangerous, better use `mkstemp'")

5
stdio-common/tempnam.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991,1993,1996,1997,1998,1999 Free Software Foundation, Inc.
/* Copyright (C) 1991,1993,1996-1999,2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -39,3 +39,6 @@ tempnam (const char *dir, const char *pfx)
return __strdup (buf);
}
link_warning (tempnam,
"the use of `tempnam' is dangerous, better use `mkstemp'")

5
stdio-common/tmpnam.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991,1993,1996,1997,1998,1999 Free Software Foundation, Inc.
/* Copyright (C) 1991,1993,1996-1999,2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -45,3 +45,6 @@ tmpnam (char *s)
return s;
}
link_warning (tmpnam,
"the use of `tmpnam' is dangerous, better use `mkstemp'")

5
stdio-common/tmpnam_r.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991,1993,1996,1997,1998,1999 Free Software Foundation, Inc.
/* Copyright (C) 1991,1993,1996-1999,2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -33,3 +33,6 @@ tmpnam_r (char *s)
return s;
}
link_warning (tmpnam_r,
"the use of `tmpnam_r' is dangerous, better use `mkstemp'")

4
sysdeps/unix/sysv/linux/gethostid.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
/* Copyright (C) 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
@ -40,7 +40,7 @@ sethostid (id)
}
/* Open file for writing. Everybody is allowed to read this file. */
fd = __open (HOSTIDFILE, O_CREAT|O_WRONLY, 0644);
fd = __open (HOSTIDFILE, O_CREAT|O_WRONLY|O_TRUNC, 0644);
if (fd < 0)
return -1;